Renogy Core LT Series (RBT24200LFPSH) Manual

Symbols Used

The following symbols are used throughout the user manual to highlight important information.

	WARNING: Indicates a potentially dangerous condition which could result in injury or death.
	CAUTION: Indicates a critical procedure for safe and proper installation and operation.
	NOTE: Indicates an important step or tip for optimal performance.

Introduction

The Renogy Core LT (Low Temperature) Series 25.6V 200Ah Deep Cycle Lithium Iron Phosphate Battery is designed for the drop-in replacement of deep-cycle lead-acid batteries with its standard Battery Council International (BCI) group size.
Weighing only half of the lead-acid counterparts, the battery can be safely discharged to 100% Depth of Discharge (DOD), delivering twice the energy. Manufactured with automotive grade battery cells, the battery features the highest safety standards and an extended 5000+ cycle life. In addition, the reliable Battery Management System (BMS) provides comprehensive protection to the battery.

Key Features

• Unparalleled Performance
  Features a greater energy density, a deeper discharge capability, a higher round-trip efficiency, and a faster charging speed in a smaller size over counterparts in the market.
• Uncompromising Quality
  Ensures an exceptional lifespan with more than 5000 cycles (80% DOD), a continuous charge current of 200A and a continuous discharge current of 200A, and a wide range of operating temperatures with the automotive grade battery cells.
• Reliable Protection Mechanisms
  Designed with a sturdy internal structure for RV use, and includes multiple levels of protection such as low temperature cut-off and precise balancing through the smart battery management system.
• Intelligent high power self-heating Function
  Equipped with a 200W self-heating function to ensure battery charging at low temperature.
• Easy to Expand
  Upgrades to lithium batteries seamlessly with the standard BCI group sizes; up to 8 batteries in 2 series and 4 parallels system connection delivering a maximum of 48V (51.2V) 800Ah with 40.96 kWh.

SKU

Renogy Core LT (Low Temperature) Series 25.6V 200Ah Deep Cycle Lithium Iron Phosphate Battery

RBT24200LFPSH

What's In the Box

Make sure that all accessories are complete and free of any signs of damage.

Required Tools & Accessories

Prior to installing and configuring the battery, prepare the recommended tools, components, and accessories.
For how to size battery adapter cables, refer to "How to Size Adapter Cables" in this manual.

Get to Know Your Product

Dimensions

Dimension tolerance: ±0.2 in (0.5 mm)

How to Size Adapter Cables

Use appropriately sized Battery Adapter Cables (sold separately) based on expected load. Refer to the table below for copper cable ampacities with different gauge sizes.

Cable Gauge Size	Ampacity	Cable Gauge Size	Ampacity
14 AWG (2.08 mm2)	35A	2 AWG (33.6 mm2)	190A
12 AWG (3.31 mm2)	40A	1 AWG (42.4 mm2)	220A
10 AWG (5.25 mm2)	55A	1/0 AWG (53.5 mm2)	260A
8 AWG (8.36 mm2)	80A	2/0 AWG (67.4 mm2)	300A
6 AWG (13.3 mm2)	105A	4/0 AWG (107 mm2)
4 AWG (21.1 mm2)	140A

The above values are from the NEC Table 310.17 for copper cables rated at 194°F (90°C), operating at an ambient temperature of no more than 86°F (30°C). Cables longer than 13 feet (4000 mm) may require thicker gauge wires to prevent excessive voltage drop in undersized wiring.

Fix the Unit to a Position

(Optional)
Securing the battery prevents damage to the battery from loose cables and bumps.

Alternative mounting methods are allowed to meet the requirements of specific applications.

Plan a Mounting Site

For optimal battery performance, it is recommended to install the battery in a clean, cool, and dry location, free from any accumulation of water, oil, or dirt. Accumulation of such materials on the battery can lead to current leakage, self-discharge, and even short-circuiting.

	Charge: -4°F-131°F / -20°C-55°C *< 32°F/0°C: The self-heating function is on. Discharge: -4°F-140°F / -20°C-60°C
	10%-95%

Sufficient air flow must be provided to prevent excessive heat build-up and to minimize temperature variation between the connected batteries.
This user manual takes a battery as an example to illustrate how to install the battery.

Wear Insulating Gloves

Remove the Dust Cover

Check the Product

Inspect the battery for any visible damage including cracks, dents, deformation, and other visible abnormalities. All connector contacts shall be clean, free of dirt and corrosion, and dry.

Do not touch the exposed electrolyte or powder if the battery is damaged.
If uncovered electrolyte or powder contacts your skin or eyes, flush it out immediately with plenty of clean water and seek medical attention.

Run the Adapter Cables Through the Insulating Sleeves

Install the Product Terminals

Ensure the cable lug and the top surface of the terminal are in contact, and place the washers on top of the lug. Do not place the washers between the battery terminal and the cable lug to avoid high resistance and excessive heating.
Avoid short-circuiting the battery terminals to prevent irreversible damage to the system and battery caused by current bursts.
Verify polarity before wiring to avoid irreversible battery damage due to polarity reversal.
To ensure safe and reliable operation of the system, please follow the manufacturer's recommended torque specifications when securing cable connections. Over-tightening can result in terminal breakage, while loose connections can lead to terminal meltdown or fire. When securing multiple cable lugs on a single battery terminal, use the included Long Terminal Bolts.

Install the Insulating Sleeves

Connect the Product to Other Devices

Please use circuit breakers, fuses, or disconnects appropriately sized by a certified electrician, licensed installers, or regional code authorities to protect all electrical equipment.

• For a Single Battery
  
• For Batteries in Parallel
  
• For Batteries in Series
  

How to Connect The Unit in Series or Parallel

Calculate Voltage and Current in Series and Parallel Connections

Do not connect batteries with different chemistries, rated capacities, nominal voltages, brands, or models in parallel or in series. This can result in potential damage to the batteries and the connected devices, and can also pose safety risks.
Avoid connecting batteries that have been purchased for more than half a year. Overtime, batteries can degrade and their performance may decrease, which can affect their ability to deliver reliable power and may lead to safety hazards.
The cables between each connected battery should be of equal length to ensure that all batteries can work equally together.
You can connect up to 4 batteries in parallel or 2 batteries in series.

Balance Batteries Prior to Connection

Before connecting batteries in series or parallel, it is important to balance them to reduce voltage differences and optimize their performance. Follow these three steps:

1. Charge each battery individually to its full capacity using a suitable charger.
   
2. Use a voltmeter to measure the voltage of each battery. It is best to keep the voltage difference of each battery less than 0.1V.
   
3. Connect all the batteries in parallel and allow them to rest together for 12 to 24 hours.
   

It is recommended to periodically rebalance the battery voltages every six months when connecting multiple batteries as a battery system. Slight voltage differences can occur among batteries over time due to factors like battery chemistry, capacity, temperature, and usage patterns.

Series Connection vs Parallel Connection Installation Steps

You can choose suitable busbars in series and parallel connections. Busbars help handle high currents and are typically arranged in a parallel or stacked configuration to distribute electrical power efficiently.
Note that the cable connection methods provided below are for reference purposes only, as the optimal approach may vary depending on the specific situation. It is essential to consider various factors, such as the cable size, equipment used, and environmental conditions.

• Parallel Connection
  

2P	Battery System	24V (25.6V) 400Ah
	Energy	10240Wh
4P	Battery System	24V (25.6V) 800Ah
	Energy	20480Wh

• Series Connection
  

2S	Battery System	48V (51.2V) 200Ah
	Energy	10240Wh

• Parallel & Series Connection
  

2P2S	Battery System	48V (51.2V) 400Ah
	Energy	20480Wh

4P2S	Battery System	48V (51.2V) 800Ah
	Energy	40960Wh

Battery Cell Balancing

The battery employs bypass circuit to maintain the balance between each battery cell group. Each battery cell group is connected with a bypass resistor and a switch in parallel. During the charging process, if the highest-voltage battery cell group reaches the set balancing starting voltage and the voltage difference between the highest-voltage and the lowest-voltage battery cell group exceeds the set voltage difference, the switch connected to the highest-voltage battery cell group will be closed to shunt the charge current around the highest-voltage battery cell group through the bypass resistor until the voltage difference drops below the set value. To avoid excessive energy loss, the battery cell balancing is only performed during the charging process.

Charging/Discharging Parameter Settings

Charge
Charge/Boost Voltage	29.0V	Boost Return Voltage	26.4V
Bulk/Absorption Voltage	29.0V	Overvoltage Disconnect	30.0V
Bulk/Absorption Voltage	29.0V / Disabled	Overvoltage Reconnect	28.4V
Discharge
Low Voltage Reconnect	25.2V	Undervoltage Warning	24.0V
Undervoltage Shutdown	20.0V

The parameters in the table are applicable to 24V (25.6V) battery packs. Please multiply by 2 for 48V (51.2V) packs.

Charging and Discharging Logic

The battery may be received at a partial state of charge (SOC) depending on the time between manufacturing and shipping. It is crucial to fully charge the battery before its initial use. In case the battery shuts off due to low SOC, promptly disconnect it from loads and charge it to prevent irreversible damage. Follow the instructions in this user manual for proper charging and usage to ensure optimal battery performance and longevity.

Charging Logic

The standard charging process for the battery involves charging at a constant current of 100A until the battery voltage reaches 29.0V, followed by charging at a constant voltage of 29.0V while tapering the charge current. The charging process is considered complete when the charge current is less than 10A (also known as tail current).
The standard charging process typically takes 2.5 hours and requires battery temperatures to be between 32°F and 131°F (0°C and 55°C) for safe charging. Leaving the battery on float will continue to balance the battery cells without damaging the battery.

Lithium batteries are compatible with various charging methods, including MPPT charge controller, AC charger, and DC-DC charger. The crucial parameter setting for these chargers is to set the charge voltage, boost voltage, or bulk voltage at 29.0V (±0.2V).
Do not overcharge or overdischarge the battery.
Do not discharge the battery at high temperatures above 140°F (60°C).
Only charge the battery with a battery charger or charge controller that is compatible with lithium iron phosphate batteries.
Do not exceed the maximum continuous charge current (200A) of the battery.

Discharging Logic

During standard discharging, the battery is discharged at a constant current of 200A until the voltage drops to 20V. To ensure safe discharging, the battery temperature should be between -4°F (-20°C) and 131°F (60°C).

To ensure safe and optimal battery usage, it is recommended to pair the battery with discharge equipment that features a low voltage disconnect (LVD) function.
Do not connect large loads to the battery when it is running low.
Do not exceed the maximum continuous discharge current (200A) of the battery.

How to Estimate the SOC

The SOC values listed below are estimated based on the resting voltage when the battery is at rest for 30 minutes, not in charging or discharging state.

SOC	Open Circuit Voltage	SOC	Open Circuit Voltage
100%	27.2V	30%	25.8V
99%	26.8V	20%	25.6V
90%	26.4V	14%	25.4V
70%	26.2V	9%	25.2V
40%	26.0V	0%	20.0V

The table above is for reference only because slight variations in battery voltage may occur among different batteries.

Self-heating Function

The normal operation of the self-heating function requires a stable charge current greater than 10A for each battery in the parallel battery bank. The self-heating function will start at optimal performance once the battery temperature drops below 32°F (0°C) a nd stop operating automatically once the battery temperature rises above 50°F (10°C).The temperature rise rate is approximately 59°F (15°C) per hour when running at full power of 200W.

Battery Management System

The battery is equipped with a Battery Management System (BMS) that provides warnings and protections against overvoltage, undervoltage, overcurrent, short circuit, high temperature, and low temperature conditions. Refer to the table below for the triggering and recovery conditions of each warning and protection.

Battery Operating Status		Condition (For Reference Only)
Battery Cell Overvoltage	Protection	Trigger	Battery Cell Voltage ≥ 3.70V
		Recover	Battery Cell Voltage ≥ 3.55V
Battery Cell Undervoltage	Protection	Trigger	Battery Cell Voltage ≤ 2.5V
		Recover	Battery Voltage ≥ 3.0V
Charge High Temperature	Protection	Trigger	Battery Temperature ≥ 140°F (60°C)
		Recover	Battery Temperature ≤ 131°F (55°C)
Discharge High Temperature	Protection	Trigger	Battery Temperature ≥ 149°F (65°C)
		Recover	Battery Temperature ≤ 131°F (55°C)
Charge Low Temperature	Protection	Trigger	Battery Temperature ≤ 32°F (0°C)
		Recover	Battery Temperature ≥ 41°F (5°C)
Discharge Low Temperature	Protection	Trigger	Battery Temperature ≤ -4°F (-20°C)
		Recover	Battery Temperature ≥ 1.4°F (-17°C)
Charge Overcurrent	Protection	Trigger	Charge Current 210A (5s)
		Recover	Discharge Current ≥1A or Recover automatically after 60s
Discharge Overcurrent	Primary Protection	Trigger	Discharge Current ≥ 220A (5s)
		Recover	Charge Current 1A or Recover automatically after 60s
	Secondary Protection	Trigger	Discharge Current ≥ 400A (200ms)
		Recover	Charge Current ≥ 1A or Recover automatically after 60s
Short Circuit	Protection	Trigger	Discharge Current ≥ 1300A
		Recover	Charge Current ≥ 1A or Recover automatically after 60s

Troubleshooting

Problem	Possible Causes	Solution
The battery is unable to be activated with a charge/discharge current greater than 1A The device is activated at resting voltage below 20V	Severe battery overdischarge due to self-discharge or parasitic loads	Revive the battery with a battery charger or charge controller featuring lithium battery activation or force charging.
The device shuts off due to undervoltage protection	The battery voltage drops below the preset threshold	Disconnect the battery from loads, and charge the battery with a current greater than 1A as soon as possible.
The battery cuts off the charging current due to overvoltage protection	The battery voltage exceeds the preset threshold during charging.	Disconnect the battery from the charging source. Reduce charge voltage by 0.2V to 0.4V for 6 hours. Attempt to fully charge the battery again with the correct voltage setting. If the problem persists with a lithium iron phosphate compatible charging source and correct voltage setting, repeat the above steps.
The battery temperature gets too low during operation and the self-heating function doesn't work very well.	The charger connected to the battery has very little current.	Check the charging current of the charger for each battery more than 10A.
The device is shorted and triggers short circuit protection	Short circuit occurs in the battery.	Remove the short circuit as soon as possible Charge the battery with a current greater than 1A.
Charge/Discharge overcurrent protection is triggered due to too high current passing through the battery.	Excessive current flows through the battery during charging or discharging.	Disconnect the battery from the charging source or loads as soon as possible.

For further assistance, contact Renogy technical support service at https://www.renogy.com/contact-us.

Specifications

General
Battery Cell Type	Lithium Iron Phosphate / Prismatic Cell
Rated Capacity (0.5C, 250C)	200Ah
Nominal Voltage	25.6V
Voltage Range	20.0V to 29.2V
Cycle Life (0.5C, 250C)	5000 Cycles (80% DOD)
Dimension	20.55 x 10.55 x 8.62 in / 522 x 268 x 219 mm
Weight	88.6 lbs. / 40.2 kg
Connection Method	Series & Parallel (2S4P)
Terminal Bolt Size	M8 x 1.25 x 15 mm
Recommended Terminal Torque	88.5 inch•lbs to 106.2 inch•lbs / 10 N•m to 12 N•m
Protection Rating	IP65
Certification	MSDS, UN38.3, FCC, CE, PSE, and UKCA
Operation Parameters
Charge Voltage	29.0V
Maximum Continuous Charge Current	200A
Maximum Continuous Discharge Current	200A
Peak Discharge Current	390A@5s
Charge Temperature Range	-4°F to 131°F (-20°C to 55°C)
Discharge Temperature Range	-4°F to 140°F (-20°C to 60°C)
Storage Temperature Range	-13°F to 149°F (-25°C to 65°C)
Operation Relative Humidity	10% to 95%

Maintenance & Storage

Inspection

Please perform regular inspections following the steps below:

• Examine the external appearance of the battery. The housing and terminals of the battery shall be clean, dry, and free of corrosion.
• Check battery cables and connections. Replace any damaged cables and tighten any loose connections.

In certain application scenarios, corrosion may occur around the terminals. Corrosion can cause increased resistance and poor contact. It is recommended to regularly apply insulation grease to each terminal. Insulation grease can form a moisture-resistant seal and protect the terminals from corrosion.

Cleaning

Please clean the battery at regular intervals following the steps below:

• Disconnect the battery from the system.
• Clear the leaves and debris from the battery.
• Clean the battery with a soft, lint-free cloth. The cloth can be dampened with water or mild soap and water if the battery is extremely dirty.
• Dry the battery with a soft, lint-free cloth.
• Keep the area around the battery clean.
• Reconnect the battery to the system.

Checking Voltage

Please check the battery voltage periodically to assess battery health. If the battery is unable to be activated with a charge/discharge current greater than 1A or the battery is activated with a resting voltage below 20V, the battery may have been severely overdischarged due to self- discharge or parasitic loads. Please stop using the battery until the fault can be corrected and the battery can be charged.

Storage

Please follow the tips below to ensure that the battery emerges from storage in a good condition:

• Charge the battery to 30% to 50% SOC.
• Disconnect the battery from the system.
• Store the battery in a well-ventilated, dry, clean area with temperatures between -13°F (-25°C) and 149°F (65°C).
• Do not expose the battery to direct sunlight, moisture, or precipitation.
• Handle the battery carefully to avoid sharp impacts or extreme pressure on the battery housing.
• Charge the battery at least once every 3 to 6 months to prevent it from overdischarge.
• Fully charge the battery when it is taken out of storage.

Important Safety Instructions

The manufacturer accepts no liability for any damage caused by:

• Force majeure including fire, typhoon, flood, earthquake, war, and terrorism.
• Intentional or accidental misuse, abuse, neglect or improper maintenance, and use under abnormal conditions.
• Improper installation, improper operation, and malfunction of a peripheral device.
• Contamination with hazardous substances or radiation.
• Alterations to the product without express written consent from the manufacturer.

General

• Wear proper protective equipment and use insulated tools during installation and operation. Do not wear jewelry or other metal objects when working on or around the battery.
• Keep the battery out of the reach of children.
• Do not dispose of the battery as household waste. Comply with local, state, and federal laws and regulations and use recycling channels as required.
• In case of fire, put out the fire with a FM-200 or C02 fire extinguisher.
• Do not expose the battery to flammable or harsh chemicals or vapors.
• Clean the battery regularly.
• It is recommended that all cables should not exceed 10 meters because excessively long cables result in a voltage drop.
• The cable specifications listed in the quick guide account for critical, less than 3% voltage drop and may not account for all configurations.
• Do not expose the battery to strong electrostatic fields, strong magnetic fields, or radiation.

Renogy Support

To discuss inaccuracies or omissions in this quick guide or user manual, visit or contact us at:
renogy.com/support/downloads
contentservice@renogy.com
For technical questions about your product in the U.S., contact the Renogy technical support team through:
renogy.com/contact-us
1(909)2877111
For technical support outside the U.S., visit the local website below:

Canada	ca.renogy.com	China	www.renogy.cn
Australia	au.renogy.com	Japan	renogy.jp
South Korea	kr.renogy.com	Germany	de.renogy.com
United Kingdom	uk.renogy.com	Other Europe	eu.renogy.com

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Documents / Resources

References

• RENOGY如果新能源 | 让每个人拥有独立清洁的能源
• Contact Us | Renogy Solar Panels and Complete Solar Kits
• Downloads
• Contact Us | Renogy Solar Panels and Complete Solar Kits
• Renogy CA Official | Trusted Energy Solutions
• Renogy AU Official | Trusted Energy Solutions
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• Renogy DE Official | Trusted Energy Solutions
• Renogy UK Official | Trusted Energy Solutions
• Renogy EU Official | Trusted Energy Solutions
• Renogy US Official | Trusted Energy Solutions

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